# equation of continuity

- The equation of continuity states that (a) air mass flow is constant, as mass can neither be created nor destroyed, and (b) the product of a cross-sectional area (
*A*), velocity (*V*), and density (ρ) is constant (*K*), or*AV*ρ =*K*. It assumes that because pressure changes are small, they have little effect on density and, therefore,*AV*=*K*or*V*=*K*/*A*. Hence, a reduced cross section gives a greater velocity.

*Aviation dictionary.
2014.*

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